[Report of the Medical Officer of Health for Orpington] page 33

Orpington 1957

[Report of the Medical Officer of Health for Orpington]

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Result of the Bacteriological Examination of the Water Supplied to Orpington during the Year 1957.

Parts per million (unless otherwise stated)

BACTERIOLOGICAL RESULTS

	No. of Samples	Before Chlorination				After Chlorination (Water Passing into Supply)
		Plate Count (Average per ml.) Colonies counted on agar		Coliform Test Percentage samples negative in 100 ml.		No. of Samples	Plate Count (Average per ml.) Colonies counted on agar		Coliform Test Percentage samples negative in 100 ml.
		Plate Count (Average per ml.) Colonies counted on agar		Coliform	E. Coli		Plate Count (Average per ml.) Colonies counted on agar		Coliform	E. Coli
		37°C. (20-24 hrs.)	22°C. (3 days)	Coliform	E. Coli		37°C. (20-24 hrs.)	22°C. (3 days)	Coliform	E. Coli
Orpington Wells	251	0.04	102.0	94.82	99.0	256	0.03	16.0	100.0	1000
N. Orpington Wells	215	1.2	53.4	3.26	26.51	221	0.7	21.2	99.10	1000
Jewels Wood Well	98	0.04	3.3	97.96	100.0	101	0.1	72.2	100.0	1000
Sundridge Well	265	110.2	101.5	98.49	100.0	256	0.1	30.5	100.0	1000
Westerham Well	249	0.1	3.0	9960	100.0	255	0.1	12.5	96.47	1000
Lullingstone Well	237	0.04	14.0	98.73	99.58	242	0.02	7.7	97.93	100.0
Eynsford Bore	121	0.02	81.0	99.17	99.17	124	0.04	1.2	100.0	1000
Eynsford Wells	231	0.03	15.0	97.40	99.57	234	0.02	11.3	97.44	100.0
Shortlands No. 1	161	0.04	4.9	100.0	100.0	256	0.2	3.6	100.0	100.0
Shortlands No. 2	92	0.1	2.2	100.0	100.0	256	0.2	3.6	100.0	100.0
Horton Kirby Well	241	0.1	27.7	96.27	98.76	246	0.2	27.0	99.59	100.0
Thames derived	–	–	–	–	–	3,438	6.4	–	99.33	99.91